16
CONDITION #2 - BOILER ATTEMPTS IGNITION (8 SECONDS) WITH ONLY A “COUGH” OR NO IGNITION:
THEN SHUTS OFF
GC-4A Light is “ON”; Red Light “ON”; Green Light “ON”; - during each 8 sec. ignition trial (5 attempts). Unit does
not run after 3 min. 45 sec. The GC-4 light then blinks.
NOTE: ON A START-UP, BOILER MAY LOCK OUT SEVERAL TIMES BEFORE ALL AIR IS PURGED FROM
GAS LINE.
MEASURE FAN PRESSURE (SEE “PROCEDURES” SECTION) AND USE ONE OF THE THREE PROCE-
DURES BELOW.
A. IF FAN PRESSURE MEASURES NORMAL: +1.5 to 1.9"W.C. for AM-100 & -150.
+1.0 to 1.4"W.C. for AM-300.
POSSIBLE CAUSE
VERIFICATION
SOLUTION
Gas Line Valves
Check that all valves in gas line,
Open all gas valves in gas line.
including combination gas valve,
are in open position.
Incorrect Gas Supply
With manometer, check gas supply
Adjust gas supply pressure as
Pressure (should be
pressure as described in
necessary.
between 4.5" to 7.0" W.C.
“Procedures” section of this manual.
for Natural Gas;11” W.C.
for Propane Gas)
Combination Gas Valve
Turn the Rocker Switch OFF and
If no 24V & no green light, check
(24V)
ON. After 35 seconds,with a
wiring. If intact and secure - replace
voltmeter, check for 24V across the
GC-4A.
gas valve terminals (MV-MV).
If read 24V & green light OFF replace
green lamp and proceed with check.
Put manometer downstream of gas
If no indication of gas flow, replace
valve. When gas valve opens
gas valve.
(Green Light “ON”) gas pressure
should increase. (Manometer will
If gas flow is confirmed, proceed
read a purge fan pressure before
with check.
valve opens).
Check Ignition Circuit
Turn Rocker Switch & Gas Valve
If spark is strong, control is ok.
(GC-4 Ignition Control)
top knob “OFF.” Turn Rocker Switch
Reconnect ignition lead.
“On” & allow unit to purge to a
sequenced lockout (temporary).
If no spark, check that the white
Turn Rocker Switch “OFF” and
(neutral) lead is securely connected
remove high tension ignition lead
from the “NEU” spade connection on
from ignition control. Turn Rocker
ignition module to neutral side of the
Switch “ON” & after 34 sec. (purge),
24V transformer.
check for spark with insulated
screwdriver between the ignition
If secure and not sparking, replace
control spud & ground.
the GC-4 ignition control.
CAUTION: Hi-voltage Potential.
